CN211946146U

CN211946146U - Automatic telescopic fork truck balanced system

Info

Publication number: CN211946146U
Application number: CN202020199294.6U
Authority: CN
Inventors: 于建东; 路富魁
Original assignee: Linde China Forklift Truck Corp Ltd
Current assignee: Linde China Forklift Truck Corp Ltd
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2020-11-17
Anticipated expiration: 2030-02-24

Abstract

The utility model relates to an automatic telescopic fork truck balanced system, it can include position sensor, control balancing piece and automatic telescopic machanism, position sensor be used for detecting the fork frame whether be higher than predetermined height and with automatic telescopic machanism electricity is connected, control the balancing piece with automatic telescopic machanism drive is connected, automatic telescopic machanism is used for the basis position sensor's signal drive control the balancing piece extension or withdrawal. When the fork frame is lower than the preset height, the forklift body shakes little, the left and right balance blocks are not required to support, the left and right balance blocks retract into the forklift body, the driving passing performance of the forklift is good, and the left and right balance blocks do not collide with ground obstacles, so that the left and right balance blocks and the ground are prevented from being damaged; when the door frame is higher than the preset height, the left balance block and the right balance block extend out of the vehicle body and keep a certain gap with the ground, and when the vehicle body shakes and inclines, the left balance block and the right balance block are in contact with the ground, so that the transverse stability is improved.

Description

Automatic telescopic fork truck balanced system

Technical Field

The utility model relates to a fork truck field specifically relates to an automatic telescopic fork truck balanced system.

Background

The balancing blocks of the existing forklift balance system are located on two sides of a driving wheel of the forklift, and when a fork frame of the forklift is lifted to a high position to transversely incline, the balancing blocks support the ground, so that the forklift is prevented from toppling, and the stability of the forklift is improved. The prior forklift balancing system has the following problems:

1) the smaller the gap between the balance block and the ground is, the better the transverse stability is, but the driving trafficability is deteriorated, because the forklift is easy to be blocked by ground obstacles during driving, is easy to be blocked on an uneven road surface or a slope, and cannot drive;

2) in order to ensure the passing performance of the forklift, the clearance between the balance block and the ground is kept too large, and the stability of the forklift is deteriorated;

3) the existing balance weight is made of metal or plastic, when the forklift runs, the balance weight collides with an obstacle, and the ground and the balance weight are easy to damage due to collision.

Disclosure of Invention

The utility model aims at providing a fork truck balanced system that can stretch out and draw back automatically to solve above-mentioned problem.

In order to achieve the above object, according to the embodiment of the present invention, an automatic retractable forklift balancing system is provided, which may include a position sensor, a left balancing block, a right balancing block and an automatic retractable mechanism, wherein the position sensor is used to detect whether the fork carriage is higher than a predetermined height and is electrically connected to the automatic retractable mechanism, the left balancing block and the right balancing block are in driving connection with the automatic retractable mechanism, and the automatic retractable mechanism is used to drive the left balancing block and the right balancing block to extend or retract according to signals of the position sensor. When the fork frame is lower than the preset height, the forklift body shakes little, the left and right balance blocks are not required to support, the left and right balance blocks retract into the forklift body, the driving passing performance of the forklift is good, and the left and right balance blocks do not collide with ground obstacles, so that the left and right balance blocks and the ground are prevented from being damaged; when the door frame is higher than the preset height, the left balance block and the right balance block extend out of the vehicle body and keep a certain gap with the ground, and when the vehicle body shakes and inclines, the left balance block and the right balance block are in contact with the ground, so that the transverse stability is improved.

Further, the position sensor is a proximity switch installed at a predetermined height on the outer gantry.

Further, the proximity switch is a hall type proximity switch, and a magnet is mounted on the fork carriage.

Still further, the proximity switch is fixedly mounted on the outside of the outer mast and the magnet is fixedly mounted on the fork carriage by a bracket.

Further, the automatic telescopic mechanism comprises an electric control hydraulic reversing valve and a left supporting oil cylinder and a right supporting oil cylinder, the electric control hydraulic reversing valve is in fluid communication with the left supporting oil cylinder and the right supporting oil cylinder through corresponding oil pipes and is electrically connected with the position sensor, the left supporting oil cylinder and the right supporting oil cylinder are respectively and fixedly installed on the left side and the right side of the vehicle body, and the left balancing block and the right balancing block are respectively and fixedly installed on cylinder rods of the left supporting oil cylinder and the right supporting oil cylinder.

Still further, the electrically controlled hydraulic directional valve is in fluid communication with the lift cylinders of the fork carriage. Because the hydraulic oil required by the telescopic action of the left and right supporting oil cylinders comes from the lifting oil cylinder, the hydraulic motor does not need to work additionally, the energy is saved, and the service life of the motor is not influenced.

Furthermore, the automatic telescopic mechanism further comprises a hydraulic connecting block, the hydraulic connecting block is provided with two three-way channels, and three ports of each three-way channel are respectively communicated with the left supporting oil cylinder, the right supporting oil cylinder and the electric control hydraulic reversing valve through an oil pipe.

Still further, the hydraulic connecting block is rectangular, and each tee channel is T-shaped.

Furthermore, the electric control hydraulic directional valve and the position sensor form an electric control loop through a relay.

Furthermore, the automatic telescopic forklift balancing system further comprises a left cover plate and a right cover plate, wherein the left cover plate and the right cover plate are respectively fixedly arranged on the left side and the right side of the forklift body and are respectively positioned on the outer sides of the left support oil cylinder, the right support oil cylinder and the left balance block and the right balance block. The left cover plate and the right cover plate are used for protecting the left support oil cylinder, the right support oil cylinder, the left balance block and the right balance block and preventing the left balance block and the right balance block from being damaged.

The utility model has the advantages that:

1) the left balance block and the right balance block can automatically extend and retract according to the lifting height position and the descending height position of the fork, the operation of a driver is not needed, and the problem that a balance system does not work normally due to human factors is avoided;

2) the clearance between the left balance block and the right balance block and the ground can be set to be minimum, so that the stability is improved; when the forklift runs, the left and right balance blocks retract into the forklift body, so that the forklift can obtain the best running passing performance.

3) When the vehicle runs, the left and right balance blocks retract into the vehicle body, and the left and right balance blocks do not collide with ground obstacles, so that the balance blocks and the ground are prevented from being damaged.

Drawings

Fig. 1 is a schematic structural view of an automatic telescopic forklift balancing system according to an embodiment of the present invention;

FIG. 2 is a hydraulic circuit diagram of the counterbalancing system of the automatic telescopic forklift shown in FIG. 1;

fig. 3 is an electrical schematic of the counterbalancing system of the automatic telescopic forklift shown in fig. 1.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

As shown in fig. 1 to 3, an automatic retractable forklift balancing system according to an embodiment of the present invention may include a position sensor 1, left and right counterbalances 2 (only the right counterbalance is shown in fig. 1), and an automatic retractable mechanism. The position sensor 1 is used to detect whether the fork carriage is above a predetermined height and is electrically connected to the automatic retracting mechanism. In the present embodiment, the position sensor 1 is a hall-type proximity switch, which is mounted at a predetermined height on the outer mast 100 of the forklift (specifically, on the outer side of the outer mast). In this case, the magnet 4 is mounted on the fork carriage 200. For example, the magnet 4 is fixedly mounted on the fork carriage 200 by means of the bracket 5. When the fork carriage 200 is lifted to a set height, the position sensor 1 senses the magnet 4 and sends a signal to the automatic retracting mechanism. It should be understood that the position sensor 1 may also be a proximity switch such as a photoelectric sensor or a touch sensor such as a pressure sensor. The left balance block 2 and the right balance block 2 are in driving connection with an automatic telescopic mechanism, and the automatic telescopic mechanism is used for driving the left balance block 2 and the right balance block 2 to extend or retract according to signals of the position sensor 1. When the fork frame 200 is lower than the preset height, the forklift body shakes slightly, the left balance block 2 and the right balance block 2 are not required to support, the left balance block 2 and the right balance block 2 retract into the forklift body, the driving passing performance of the forklift is good, and the left balance block 2 and the right balance block 2 cannot collide with ground obstacles, so that the left balance block 2 and the right balance block 2 are prevented from being damaged; when the portal frame is higher than the preset height, the left balance block 2 and the right balance block 2 extend out of the vehicle body and keep a certain gap with the ground, and when the vehicle body shakes and inclines, the balance blocks are in contact with the ground, so that the transverse stability is improved.

In the present embodiment, the automatic telescoping mechanism includes an electrically controlled hydraulic directional valve 31 and left and right support cylinders 32 (only the right support cylinder is shown in fig. 1), wherein the electrically controlled hydraulic directional valve 31 is in fluid communication with the left and right support cylinders 32 through

respective oil pipes

33a, 33b, 33c, 33d, 33e, 33f and a hydraulic connection block 34 to form a control oil path for controlling the telescoping of the left and right support cylinders 32. The electrically controlled hydraulic directional control valve 31 is connected to the oil tank 400 through an oil return pipe 33 g. The electrically controlled hydraulic directional valve 31 is electrically connected to the position sensor (proximity switch) 1. Specifically, the electrically controlled hydraulic directional valve 31 and the proximity switch 1 form an electric control circuit through a relay K, see fig. 3. The left and right support cylinders 32 are respectively and fixedly arranged on the left and right sides of the vehicle body, and the left and right balance blocks 2 are respectively and fixedly arranged on the cylinder rods of the left and right support cylinders 32. Preferably, the electronically controlled hydraulic directional valve 31 is in fluid communication with the lift cylinders 300 of the fork carriage 200. Because the hydraulic oil required by the telescopic action of the left and right supporting cylinders comes from the lifting cylinder 300, the hydraulic motor does not need to work additionally, thereby saving energy and not influencing the service life of the motor.

In this embodiment, the hydraulic connecting block 34 is provided with two three-way channels, and three ports of each three-way channel are respectively communicated with the left and right support cylinders 32 and the electrically controlled hydraulic directional valve 31 through an oil pipe. Specifically, the electrically controlled hydraulic directional valve 31 communicates with the hydraulic connection block 34 through

oil pipes

33a and 33b, the left support cylinder 32 communicates with the hydraulic connection block 34 through

oil pipes

33c and 33d, and the right support cylinder 32 communicates with the hydraulic connection block 34 through

oil pipes

33e and 33 f. The

oil pipes

33a, 33c and 33e are respectively connected with three ports of one three-way channel of the hydraulic connecting block 34, and the

oil pipes

33b, 33d and 33f are respectively connected with three ports of the other three-way channel of the hydraulic connecting block 34. By arranging the hydraulic connecting block 34, the automatic telescopic mechanism can be greatly simplified, and the installation and maintenance efficiency is improved.

For the convenience of manufacture, the hydraulic connecting block 34 is rectangular, and each three-way channel is T-shaped. It should be understood that in other embodiments, hydraulic connector block 34 may be replaced with two three-way connectors.

In addition, the automatic telescopic forklift balancing system may further include left and right cover plates 6 (only a right cover plate is shown in fig. 1) fixedly installed on left and right sides of the vehicle body, respectively, and located on outer sides of the left and right support cylinders and the left and right balance weights, respectively. The left cover plate and the right cover plate are used for protecting the left support oil cylinder, the right support oil cylinder, the left balance block and the right balance block and preventing the left balance block and the right balance block from being damaged.

It should be understood that the automatic retraction mechanism may also be electrically powered. For example, the automatic retracting mechanism includes an electric push rod on which left and right balance weights are fixedly mounted. The electric push rod and the position sensor (proximity switch) form a control loop through a relay. When the position sensor detects that the fork carriage is raised to a predetermined height or above, the electric push rod pushes out the left and right weights, and vice versa.

The working principle of the present invention is briefly described as follows: when the fork frame 200 is lifted to a preset height or above, the magnet 4 on the fork frame 200 triggers the position sensor (proximity switch) 1, at the moment, the proximity switch 1 is switched off, the relay K is switched off, the electric control hydraulic reversing valve 31 is de-energized, the electric control hydraulic reversing valve 31 is positioned at a first position, pressure hydraulic oil in the lifting oil cylinder 300 flows into the left and right supporting oil cylinders 32 through the electric control hydraulic reversing valve 31, the

oil pipes

33a, 33c and 33e and the hydraulic connecting block 34 and flows back to the oil tank 400 through the

oil pipes

33d, 33f, 33b and 33g, and the stretching action of the left and right supporting oil cylinders 32 and the left and right balance blocks 2 is realized; when the fork carriage 200 descends to a preset height or below, the magnet 4 on the fork carriage 200 triggers the proximity switch 1, the proximity switch 1 is closed, the relay K is closed, the electric control hydraulic directional valve 31 is electrified, the electric control hydraulic directional valve 31 is reversed, namely, the position is at the second position, pressure oil in the lifting oil cylinder 300 flows into the left and right supporting oil cylinders 32 through the electric control hydraulic directional valve 31, the

oil pipes

33b, 33d and 33f and the hydraulic connecting block 34 and flows back to the oil tank 400 through the

oil pipes

33c, 33e, 33a and 33g, and retracting actions of the left and right supporting oil cylinders 32 and the left and right balance blocks 2 are realized.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications of the invention can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The automatic telescopic forklift balancing system is characterized by comprising a position sensor, a left balance block, a right balance block and an automatic telescopic mechanism, wherein the position sensor is used for detecting whether a fork frame is higher than a preset height and is electrically connected with the automatic telescopic mechanism, the left balance block and the right balance block are in driving connection with the automatic telescopic mechanism, and the automatic telescopic mechanism is used for driving the left balance block and the right balance block to extend or retract according to signals of the position sensor.

2. The automated telescopic forklift balancing system according to claim 1, wherein the position sensor is a proximity switch mounted at a predetermined height on the outer mast.

3. The automated telescopic forklift balancing system of claim 2, wherein the proximity switch is a hall type proximity switch and the fork carriage has a magnet mounted thereon.

4. The automated telescopic forklift balancing system of claim 3, wherein the proximity switch is fixedly mounted on the outside of the outer mast and the magnet is fixedly mounted on the fork carriage by a bracket.

5. The automatic telescopic forklift balancing system according to claim 1, wherein the automatic telescopic mechanism includes an electrically controlled hydraulic directional control valve and left and right support cylinders, the electrically controlled hydraulic directional control valve is in fluid communication with the left and right support cylinders through corresponding oil pipes and is electrically connected to the position sensor, the left and right support cylinders are respectively fixedly installed on left and right sides of the vehicle body, and the left and right balance blocks are respectively fixedly installed on cylinder rods of the left and right support cylinders.

6. The automated telescopic forklift balancing system of claim 5, wherein the electrically controlled hydraulic directional control valve is in fluid communication with the lift cylinders of the fork carriage.

7. The automatic telescopic forklift balancing system of claim 5, wherein the automatic telescopic mechanism further comprises a hydraulic connecting block, the hydraulic connecting block is provided with two three-way channels, and three ports of each three-way channel are respectively communicated with the left and right support cylinders and the electrically controlled hydraulic directional control valve through an oil pipe.

8. The counterbalancing system for a self-retracting forklift as recited in claim 7, wherein said hydraulic connecting block is rectangular and each three-way channel is T-shaped.

9. The automated telescopic forklift balancing system according to claim 5, wherein the electronically controlled hydraulic directional control valve and the position sensor form an electrical control circuit via a relay.

10. The automated telescopic forklift balancing system according to any one of claims 5 to 9, further comprising left and right cover plates fixedly installed on left and right sides of the vehicle body, respectively, and located on outer sides of the left and right support cylinders and the left and right counterbalances, respectively.